Process for protecting animal fiber



Patented Nov. 27, l928. I i v v v UNITED STATES PATENT oer-ice.

GERMANY, ASSIGNOBS, BY KESNE ASSIGNMENTS, TO GRASSELLI DYESTUFF COR- P ORATION, OF NEW YORK, N. Y., A CORPORATION 01* DELAWARE.

PROCESS FOR PROTECTING ANIMAL FIBER. No Drawing. Application filed June 22. 1925, Serial No. 38,901, and in Germany August 21, 1924 i In U. S. Patent. No. 1.419.497 there isldeat a high temperature. The wool is then scribed a process for protecting animal fiber washed, acidified with acetic acid, washed under treatment with alkaline liquids which and dried. The yarn so treated retains its consists in adding to the alkaline liquid sugar texture, elasticity and strength whereas wool 60 5 or sulphite cellulose liquor or the active consubjected to a like treatment without a prostituents thereof or both sugar and sulfite tective agent has a harder texture and shows cellulose liquor or the active constituents a loss of about 9 per cent of its extensibility thereof. and about 23 per cent of its tensile strength.

We have now found that the sulphurized What we claim is,

10 phenols, which form a slightly yellow colored 1. The method of protecting animal fibers solution with an aqueous sodium carbonate from the injurious efiect of alkaline liquids, solution such as are obtainable by treating which comprises treating the fibers with an phenols with sulphur in strong sulphuric acid alkaline liquid in the presence of a sulphuror with sulphur chloride (see French Patent ized phenol which does not possess the prop- No. 537,207, British Patent No. 13,657/1913, erties of a dyestutf and which is soluble in a German Patents Nos. 362,383 and 410,973, sodium carbonate solution with only a slight etc.) have an effect similar to that of sugar Color. andthat of sulphite cellulose liquor or its 2. The method of protecting animal fibers active constituents for the purpose in quesfrom the injurious effect of alkaline liquids, 65

tion. which comprises treating the fibers with an The following examples illustrate the inalkaline liquid in the presence of a sulphurvention without limiting it, the parts being ized phenol, obtainable by treating phenols by weight: I with sulphur and strong sulphuric acid.

1. '25 grams of woolen yarn are treated for 3. The method of protecting animal fibers 70 half an hour at 40 C. in a bath consisting of from the injurious effect of alkaline liquids,

' 1 litre of water, 10 grams of crystallized which comprises treating the fibers with an sodium sulphide and 5 grams of the solid alkaline liquid in the presence of the sodium colorless sodium compound of the sulphurderivative of a sulphurized phenol, obtainized product obtainable-from chlorophenol. 'able by treating phenols with sulphur and The wool is then washed and treated with strong sulphuric acid at a high temperature. dilute acetic acid for neutralizing any resid- 4. The method of protecting animal fibers ual alkali; it is then again washed and dried. from the injurious effect of alkaline liquids, During this treatment the woolen yarn does which comprises treating animal fibers with I not lose either in strength or in elasticity as an alkaline liquid containing an alkaline 80 is shown by tests made on the Schopper-testcompound and a sulphurized phenol, said suling-machine whereas when wool is submitted phurized phenol being soluble in an aqueous to the same treatment but with omission of sodium carbonate solution with a slightly the sulphurized chlorophenol the extensibilyellow color. the weight of sulphurized ity is diminished by 38% and the tensile phenol in said alkaline liquid being about 85 40 strength by 46%. one-third of the weight of alkaline compound 2. 25 grams of woolen yarn are treated for in said alkaline liquid.

half an hour at 75-80 C. in a bath consisting In testimony whereof we afiix our signaof 1 litre of water, 15 grams of anhydrous tures. sodium carbonate and 5 grams of the sodium com ound of the product of the reaction of DR. PAUL ONNERTZ.

sulp ur and strong sulphuric acid on phenol Dr. BENNO SCHWKRZEL. 

